Alternating-current electromagnet.



D. L. LINDQUIST. ALTERNATING CURRENT ELEOTROMAGNET.

APPLICATION FILED AUG. 187.1906,

.Patented 111111.21, 1911 .n.w.. a0 MJ, V 1

Inventor:

by 77W Arty Uniiriin sfrnriis Bernier or ics,

DAVID L. LINDQUIST, F YONKERS, YRK, ASSIGNGR T0 OTS ELEVEGR @GNL- PANY, 0F JERSEY CITY, NEW JERSEY, A COREGRATIN 0F NEW ALTERNATING-CURRENT ELEGTROMAGNEG.

Specification of Letters Patent.

Patented Har. 21, 1911 Application Med August 1S, 1906. Seria No. 331,186.

lb all whom it may concern:

Be it known that l., DAVID L. LINDQUIST, a subject ot' the King of Sweden, residing in Yonkers, in the county of XYcstchester and State oi ,New York, have invented a new ind useful improvement in Alternating- (lurrent lectroinagnets, of which the fol- Ilowing is a specilication.

' device therefor. This illustration is merely for the purpose of pointing out a inode of application of my invention and it should therefore be understood that the application oli the invention may be general.

In this4 particular instance an alternating current electrn-inagnet M is mounted on the movable traine 1 which in turn is mounted in the'bearings 2. f

8, 3 designate lateral arms projecting rom the rotatable traine 1 and adapted to engage .the outer ends 4, d, respectively, of the brake levers 5, which are suitably pivoted to xedsupports and carry at their inner ends the brake shoes 7, 7 associated with the brake pulley 37 which is fixed to the driving shaft 38 of a motor, for example. ,Opposite the brake shoes 7, 7 are an additional set of brake shoes pivoted to the brake arms 8, S which in turn. are pivoted at 9, 9 to the rotatable trame 1. Rigidly connected with the amns 8, 8 are the substantially vertical arms 10 10 which are pivoted at 1 1, 11 to the screw threaded rods 12, 12.

The inner ends of the screw threaded rods 12, 12 pass .into ,screw threaded openings in the extensions 14, le of the electroniugnet and armature 21,'res ectively. rEhe projections lit, let lit snugy Within thebesrings 13, 13 of the end plates 1G, 1G ci the casing which incluses the elcctrounegnet end arnmture. The distances of the electro-mug net and armature from the pivotal. points 11 may be adjusted by reason of the screw threaded connections, and the parts then locked together by means oi the nuts 15, 15. On the rods 12, 12 are also mounted the compression brake springs 36, 36, the tension of which. ina-y be varied by means of the nuts 18, 18. which latter are locked in position by means of the smaller nuts 19. The outer faces of the plates 1G. 16 adjacent the bearings 13. 13, andthe inner faces of the nuts 18, 18, are suitably formed to receive thewsprings 30, 3G and hold the. same in proper position.v

The electro-magnet 2() preferably. coinprises a plurality oi. poles each of which .comprises laininations 22 held in position by dowel pins 23. The armature 21 coniprises projections corresponding to the .poles of the magnet and comprisingf also laminations 22 held in position by the dowel pins 23". The solenoids 26 of the electro-magnet may be held in fixed position relative to the casingr 17, but in this instance they are tixcd to the electro-magnet 20 by means of the bolt 251 27 designates an insulated terminal 'for the solenoids 26, but it should be understood that there may be n plurality oi such terminals.'

The electro-magnet may be wound for direct current if desired. ln the majority of cases in practice, however, it is desirablel only in connection. with alternating; current electro-magnets to provide means for retarding the motion of the movable parts actuated by the magnet., This is for the reason that an alternatingr current magnet tends to operate its armature and the parts connected thereto with a too sudden Inovenieut, which may injure such movable parts.

As shown in the drawing, the solenoids 26 are so connected to the polar projections of the magnet 20 that they leave recesses for the reception of the corresponding projections ot the armature 21, and when in normal position said solenoids surround both the poles of the magnet and the projections ot' the armature. The winding for the electro-magnet may be single phase, two, phase, or iiiiiltiphase. The form of winding is not herein illustrated as it does not par se forni a part of this invention. As to such wind in` reference should be made'to my patents on electro-magnets, No. 733,549, granted July 1l, 15103. No. 711,773, granted Nov. Qt, 1903, and Fo. 764,608, granted July 12, 1904.

Both the electro-magnet 20 and the armature 21 in this instance have ay longitudinal movement in the casing 17, each being giiiided by pins 24, 24: secured to the inner faces of the end plates 16, 16. Their movement is also guided by the projections 14, 1l in the bearings 13, 13, and by the pistons 39, 39 which tit snugly .within the end portions ot the casing `17gl These pistons are connected respectively to' the electro-magnet Q0 and the armature 21, and are resisted in their movement by the insulating liquid 2S which is conlined Within the casing 17 and iminerses the entire electro-magnet and the entirefarmature. Around each piston is a passage way 34 at a suitable point in the casing 17, but this passage way is made adjustable by means of the set screw 35 so as to restrict the flow of liquid from one side of a piston to the other. rthere may be one or more of the restricted passages 34. Other portions oit the casing 17 near the face plates 16, 16- contain additional passages 31, 31, and 3Q, 3Q which are normally closed by means of the ball check valves 29, 29. These check valves may be spring-pressed but in the drawing they are shown held in place by gravity and may be removed by nnloosening the nuts 30, 30. The latter may also be ein-l ployed totadjustably limit the movement ot' the balls Q9, 29.

rl`he operation of the entire construction illustrated in the drawing is as follows:

l, pon sending current into the solenoids 26.r

the check valves, however, the liquid which is conined in the casing 17 must passthrough the restricted passages 34, and by varying the size of this restricted passage,

, such movement may be regulated as desired.

Obviously the electro-magnhmay be fixed and the armature only made movable with respect to the casing 17, but in connection with the compound'brake it is desirable toy have both movable. Now when the electromagnet is energized and the armature pro-- jections brought into engagement with the poles of the electro-magnet, the brake f springs 3G, 36 will be compressed and the primary brake shoes released from thc brake pulley so thatthe motor may drive the 5 shaft 38. The spring 6 bearing against the bed plate 40 and connected to the secondary brake levers 5, 5, normally maintain the sec- ,l ondary brake shoes l,

out of contact with the brake pulley 37. Upon the denergizarotating parts will rotate the frame 1, primary brake, and the entire electro-magnetic device M. One of the arms 3 of the frame 1 will be retarded by reason of the automatic closure of'the check valves compelling the liquid to ilow through the restricted passages. But on the return movement the check valves will be automatically opened and the liquid will have a comparatively free flow through the passages 32, 32, and

31, 31 from the outer sides of the pistons to the inner sides;

Obviously those skilled in the art may make various changes in the details and arrangement of parts without departing from the spirit and scope of m invention, and I desire therefore not to be imited to the preoise construction'herein disclosed.

Having thus described my invention. what' I claim and desire to have protected by Letters Patent of the United States is 1. The combination with an electromesponsive device comprising a movable inagnet and al movable armature mutually coacting, of means for mmersing said device in an insulating liquid, and means controlled by said liquid for regulating the mutual action of themagnet and armature.

Q AThe combination with a mutually co acting magnet and armature movable to ward and from each other, of a casing inclosing the Same and containing liquid, and means associated with said liquid'for materially restricting the movement ofv said co-acting members toward each other.

3. The combination with a mutually coacting magnet and armature movable t0- ward and from eachothenof a casing inciosing the same and formed with a plurality or passages, and a check valve associated with one of said passages.

fl. The combination With an electro-responsive device lcomprising a mutually coacting magnet and armature, oft a casing inclesing the same and formed with passages therein one ot' said passages being-of a size `to materially restrict the flow of a liuid therethrough, a check valve in one of said passages, and means for adjusting 4the size ot said restricting passage, said passages governing the operation of the co-aeting members. l

5. The combination with an electro-responsive device comprising a movable magnetand a movable armature, of a casing inclosing said device, said casing having passages controlling the flow of liquid from one side to the other et said movable parts, a check valve associated with one of said passages, and an adjustable screw projecting into another et said passages 6. The combination with an alternating current electro-magnet comprisingv a movable magnet and a movable armature, of a piston connected to each of said movable members, a casing entirely inclosing said electro-magnets and pistons and adapted to contain a tiuid, said. casing having a plurality of passages for the liow'of fluid from one sideto the other of each et said pistons, and check valves for regulating the movements of said pistons.

T. The combination with an electro-responsive device, of a casing linclosing the same and having a plurality oi' passages within the walls ol the casing, a check valve associated with one of said passages, the other passage being of such size as to materially restrict the How of a liquid therethro gh.

S. The combination with an electro-responsive device, oit a casing inclosing the same and formed with passages therein, a check valve 1in one of said passages, and means for adjusting the size of another of said passages to a size to materially retard the flow of a fluid therethrough.. v

il. The combination with an electro-responsive device having a movable member,

of a casinginclosing said device, said casing being formed with passages adjacent said member, a check valve associated with one of said passages, and a'set screw projecting into the other passage and restricting it sutliciently to materially retard the" flowot a liquid therethrough.

10. The combination with an actuating device comprising a movablepiston, of a casing inclosing ysaid device, and adapted to contain a liquid, said casing having a said piston to the other, and a cheek valve i for regulating the movements of said piston.

l1. `The combination with an alternating current electro-magnet, of a movable piston connected thereto, a casing entirely inclosing said electro-magnet and 'piston and forming a cylinder for the piston arranged to contain a fluid, said casing having a plurality of passages for the flow of fluid from one side of said piston to the other, andv a check valve for regulating the movements of said piston.

Vl2. The combination with an actuating device comprisingl a plurality of movable pistons, of a casing inelosing said device and adapted to contain liquid, saidcasing having a plurality of passages located externally ot' the pistons to permitthe liquid to flow from one side to the other of said pistons, and check valves -associated with some of said passages to restrict the move` ment of said pistons in predetermined directions.

13. The combination with an actuating device' comprising two pistons movable toward and away from each other, of af casing for confining Huid and immersing said actuating device, said casing having a plurality oi restricted passages for permitting the fluid to flow slowly from one side of said pistons tothe other, and a plurality ot4 check valves associated with free passages to permit free .movement of said pistons in predetermined directions.

14. The combination with an electro-responsive device having a plurality of moving parts, of a casing for confining liquid and innnersing the said device therein, said casing having passages extending through the walls of the casing and of a size to malterially restrict the flow of a-liquid therein for retarding the movement of said members in predetermined directions, and check valves associated with free passages in said casing.

15. The combination with an alternatingcurrent electro-imignet, of an armature associated therewith, means for holding said armature and electro-magnet apart, a casing for confining an insulating liquid and in'nnersing said electro-magnet and armature, two pistons itting within said casing, one connected to the electro-magnet and .the other to the armature, said casing having restricted passages 'around said pistons, and check valves associated with comparatively free passages in said casingv to retard the Hmovement of the armature and magnet to.-

Ward each other when the latter is ener- 'zed. I l 16% The `combination with an electro-responsive device comprising a magnet and its In testimony whereof, I have signed my armature, of a casing inclosng said device name to this specification in the presence of 10 and adapted to contain a liquid, said castwo subscribing witnesses.

ingl being' ii'ovided with assaoes ermit- T v t'iiig the ioilv of fluid past te ariiatulife, and DAVID L' LINDQD LSI" a device adjustable' from the exterior of the Witnesses: casing for varying the size of one of said CHARLES M. NISSEN, passages. HYACLT L. GARRISON.

4 Copies of this patent may be obtained for ve cents each, byfaddressing the Commissioner of Patents,

Washington, D. C. 

